The Motley Fool's CAPS investing service is a great way for investors to work together to beat the market -- and maybe get famous while they're at it. Among its features, CAPS lets users blog about their picks, investing strategy, market view, favorite vegetable, or whatever floats their boat.

As the CAPS blogosphere continues to grow, players are adding more great content on a daily basis. To make it easier to find some of the gems out there, I've dug through the past week's posts to find some of CAPS' best insights. Of course, with room for only seven posts here I can't possibly cover all of the great stuff in the CAPS blogosphere. So when you're done here I highly recommend heading over to CAPS and checking out what some of the other investors have to say.

Refiners: a nice place to visit, but I wouldn't want to live there
In his most recent blog post, CAPS All-Star TMFDeej visits the world of refiners, and looks specifically at U.S. refiners like Valero (NYSE:VLO) and Western Refining (NYSE:WNR). Although the recent moderation in crude oil prices has made investors a bit more positive on these names, Deej doesn't think this will continue. Head over to Deej's blog to find out why.

The CDN market may implode but ...
CAPS blogger TMFMileHigh is fully on board with the fact that many companies operating content delivery networks (CDNs) will go under, and thinks that this eventuality will be beneficial to Akamai (NASDAQ:AKAM). Check out his blog post to get the scoop.

Cameco takes a huge hit today
Uranium producer Cameco has fallen around 40% from its 52-week high on a string of bad news, and it seems to just keep coming. CAPS blogger Gingerbreadman55 has taken a look at the situation and concluded that "this stock .... is a no brainer buy opportunity." Bold? It sure is. Be sure to read his blog post to find out what brought him to such a conclusion.

Like this will happen
Does it just burn your backside that financial companies like Lehman Brothers (NYSE:LEH) and Merrill Lynch (NYSE:MER) could be using government money to keep their heads above water while their executives take home handsome bonuses? Well TMFGebinr shares an idea on his blog to counteract that. As the title of the post suggests, it's not something that's at all likely, but it's an interesting idea nonetheless.

Who's telling the truth about the economy?
The times are tough out there, and worst of all is that it seems unclear whom you can rely on to give you the straight scoop on what's really happening. So where does CAPS blogger WPThatcher turn? To the debt collectors like Asset Acceptance (NASDAQ:AACC) and Asta Funding. Click through to WPThatcher's blog to read what he found out.

The top-rated sin stocks
Who tops the charts when it comes to making those "sinful" products? Leave it to TMFBigVice to provide the dirt. In a recent blog post, this sin-loving CAPS member highlighted Diageo (NYSE:DEO) and Imperial Tobacco as two of the top sin stocks. Read BigVice's blog post for the full list.

New CAPS contest!
How can you use your stock-picking prowess to make money in CAPS? I'm glad you asked! Check out CAPS blogger LurkyLurky's recent post to find the answer.

And that's our roundup for this week. Be sure to check back next week for more great blogging action. In the meantime, why not head over to CAPS and add your two cents to the community pool?

More CAPS Foolishness:

Asset Acceptance Capital is a Motley Fool Hidden Gems Pay Dirt selection. Diageo is a Motley Fool Income Investor pick. Akamai Technologies is a  Motley Fool Rule Breakers recommendation. 

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Fool contributor Matt Koppenheffer does not own shares of any of the companies mentioned. The Fool's disclosure policy enjoys reading these blogs even more than watching the Olympics, and the disclosure policy is a huge Michael Phelps fan. Go USA!